package com.lcc.gulimall.product.service.impl;

import com.lcc.gulimall.product.service.CategoryBrandRelationService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.lcc.common.utils.PageUtils;
import com.lcc.common.utils.Query;

import com.lcc.gulimall.product.dao.CategoryDao;
import com.lcc.gulimall.product.entity.CategoryEntity;
import com.lcc.gulimall.product.service.CategoryService;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {
    @Autowired
    CategoryBrandRelationService categoryBrandRelationService;
    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        //1 查出所有分类
        List<CategoryEntity> entities = baseMapper.selectList(null);

        //2 组装成父子的树形结构
        //2.1 找到所有的一级分类
        List<CategoryEntity> level1Menus = entities.stream().filter((categoryEntity) ->
                categoryEntity.getParentCid() == 0
        ).map((menu)->{
            menu.setChildren(getChildren(menu, entities));
            return menu;
        }).sorted((menu1,menu2)->{
            return (menu1.getSort()==null?0:menu1.getSort()) - (menu2.getSort()==null?0:menu2.getSort());
        }).collect(Collectors.toList());
        return level1Menus;
    }

    @Override
    public void removeMenuByIds(List<Long> catIds) {
        //TODO 1.检查当前删除的菜单，是否被别的地方引用

        //逻辑删除
        baseMapper.deleteBatchIds(catIds);
    }

    //[2,25,225]
    @Override
    public Long[] findCatelogPath(Long catelogId) {
        List<Long> paths = new ArrayList<>();
        List<Long> res = findParentPath(catelogId, paths);
        Collections.reverse(paths);
        return res.toArray(new Long[0]);
    }

    @Transactional
    @Override
    public void updateDetail(CategoryEntity category) {
        this.updateById(category);
        if(!StringUtils.isEmpty(category.getName())){
            categoryBrandRelationService.updateCategory(category.getCatId(), category.getName());
            //TODO 更新其他关联
        }
    }

    //225,25,2
    private List<Long> findParentPath(Long catelogId, List<Long> paths){
        //1.收集当前节点id
        paths.add(catelogId);
        CategoryEntity byId = this.getById(catelogId);//先获取全部信息
        if(byId.getParentCid()!=0){
            findParentPath(byId.getParentCid(), paths);
        }
        return paths;
    }


    /**
     * 递归寻找所有菜单的子菜单
     * @param root 当前菜单
     * @param all 所有数据
     * @return root的子菜单
     */
    private List<CategoryEntity> getChildren(CategoryEntity root, List<CategoryEntity> all){
        List<CategoryEntity> children = all.stream().filter(categoryEntity -> {
            return categoryEntity.getParentCid() == root.getCatId();
        }).map(categoryEntity -> {
            //1.找到子菜单
            categoryEntity.setChildren(getChildren(categoryEntity, all));
            return categoryEntity;
        }).sorted((menu1, menu2) -> {
            //菜单排序
            return (menu1.getSort()==null?0:menu1.getSort()) - (menu2.getSort()==null?0:menu2.getSort());
        }).collect(Collectors.toList());
        return children;
    }

}